I hear you on the wiring....I have wired many rides for people, and made good money doing it. People have some kind of "fear" when it comes to wiring..but I enjoy it as well.
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At this point I ended up diassembling, and 'rebuilding' the heater box. When I drilled out the rivets and removed the cover, I realized the flap seals were still soft and in good shape, but they were replaced anyway.